The RNS 510 is a lovely head unit, looks the business, great having the SD card and the hard drive for music.
Copied CD's are a bit twitchy in the DVD player, some I have are unwatchable, although you never really sit in the car and watch the DVD anyhow.
The Satnav is nowhere near as good as TomTom. It always seems to avoid the smaller C class roads, even if you choose to go the shortest route. Unless you have the version 3 disc you cannot input postcodes.
Saying that I wouldn't be without mine.
I think recaro seats look a bit boy racery (i know racery is not a word but never mind), prefer my standard seats, but I have an Edition 30 so anything but the tartan wouldn't be right.